What 4 things do all animals have in common?
multicellular, heterotroph, eukaryotic, motile
What kind of circulation does an animal have?
vascular system, diffusion
what is an acoelomate?
animal lacking coelom, no body cavity
what is a psuerdocoelem?
one basic body cavity
what is a true coelem?
body cavity formation
How many germ layers does a sponge have?
What is diploplastic?
2 germ layers
what is a sac-like digestive system?
primitive, same hole for anus and mouth
what is a tube-like digestive system?
seperate anus and mouth
What is a net nervous system?
What is cephelization?
concentration of nerves at front of body (no brain)
what is centralization?
developed sense organs (brain)
what is open circulation?
food and oxygen is not enclosed in tubes
what is closed circulation?
food and oxygen is enclosed in tubes
what are the 3 main ways to maintain homeostasis?
source of heat, way to conserve heat, way to expel heat
What is ectothermy?
body temp. changes with environment
what is endothermy?
generate and retain heat